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Roman/Arab numerals conversion disk

This disk converts Roman numerals into Arab numerals and vis versa. Learning Roman numerals is a good way to exercise logic and counting. Even if Roman numerals are no more in use today, they can still be found in our daily lives, on monuments, watch dials, to number book chapters, to date films, ... »
converts, versa, dials, geneva, curious
Note
Difficulté
Durée0h 30 min.
Date11.10.2013
Langue(s)
français english

Chemical battery

Making a battery helps to understand how a chemical reaction can produce electricity. It shows also that in a battery there is no real stock of electricity, but the chemical products needed to generate some. It is important to understand how batteries work as they are more and more used in our daily ... »
batteries, pads, polluting, kilowatt-hour, mains
Note
Difficulté
Durée3h 0 min.
Date16.05.2013
Langue(s)
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